/Engine/Source/Runtime/Core/Public/Serialization/StructuredArchiveSlots.h
Contains a value in the archive; either a field or array/map element. A slot does not know it's name or location, and can merely have a value serialized into it. That value may be a literal (eg. int, float) or compound object (eg. object, array, map).
class FStructuredArchiveSlot : public [UE::StructuredArchive::Private::FSlotBase](API\Runtime\Core\Serialization\FSlotBase)